First off, thank you for the quick responses! Sometimes, topics can go into exile with no response, so getting not one, but three responses is great!
Under no circumstance would I be looking to "reinvent the wheel", but seeing as how the data is stored in XML files and XSL would be used to create the layout, it shouldn't be hard. Currently, the discussion boards are built with divs and spans for everything, which works...but I'm just trying to see if this alternative would work. Working for a university, the applications available to work with don't consist of the large complexities seen with hugely popular sources like phpBB and vBulletin.
Regarding the appearance of a forum using 's, that's not an issue. We use a lot of floats and width->100% to create -like 's. Everything done to make a forum look a certain way with s can be replicated without much hassle using 's by us...I'm just wondering if it would help with screen readers, seeing as how our University as "at the forefront" of accessibility.